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`AC_USE_SYSTEM_EXTENSIONS` takes care of defining feature_test_macros(7)
thereby allowing us to remove a few manual `#define`s
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This is needed in case `<unistd.h>` was included before "execvpe.h"
w/o `_GNU_SOURCE` set (on Glibc systems)
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Turns out `process` reuses `unix`'s execvpe() implementation,
and the refactoring in f24ba78f68b2cbc4f4afadc8dd60fc2935357255
broke process.
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The previous code was prone to conflicts with when the platform happens
to expose a `execvpe(3)` implementation in its libc.
This commit renames the internal implementation to `__hsunix_execvpe` as
well as adding an autoconf-detection for the presence of `execvpe(3)`,
in which case `__hsunix_execvpe()` forwards the call to `execvpe(3)`.
Moreover, the code has been cleaned up to remove likely bitrotted CPP
conditionals.
This should fix #22
(This also partially addresses #11 on platforms which have a
libc-provided `execvpe(3)`)
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Also adds System.Posix.Process.Internals in order to make the deps work out.
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Herbert Valerio Riedel
Stephen Paul Weber
Ian Lynagh